/*
 Tests for the interrupt allocator.
*/

#include <stdio.h>
#include "unity.h"
#include "esp_types.h"
#include "esp32s2/rom/ets_sys.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "freertos/queue.h"
#include "freertos/xtensa_api.h"
#include "soc/uart_periph.h"
#include "soc/dport_reg.h"
#include "soc/gpio_periph.h"
#include "esp_intr_alloc.h"
#include "driver/periph_ctrl.h"
#include "driver/timer.h"

#define TIMER_DIVIDER 16                             /*!< Hardware timer clock divider */
#define TIMER_SCALE (TIMER_BASE_CLK / TIMER_DIVIDER) /*!< used to calculate counter value */
#define TIMER_INTERVAL0_SEC (3.4179)                 /*!< test interval for timer 0 */
#define TIMER_INTERVAL1_SEC (5.78)                   /*!< test interval for timer 1 */

static void my_timer_init(int timer_group, int timer_idx, int ival)
{
    timer_config_t config;
    config.alarm_en = 1;
    config.auto_reload = 1;
    config.counter_dir = TIMER_COUNT_UP;
    config.divider = TIMER_DIVIDER;
    config.intr_type = TIMER_INTR_LEVEL;
    config.counter_en = TIMER_PAUSE;
    /*Configure timer*/
    timer_init(timer_group, timer_idx, &config);
    /*Stop timer counter*/
    timer_pause(timer_group, timer_idx);
    /*Load counter value */
    timer_set_counter_value(timer_group, timer_idx, 0x00000000ULL);
    /*Set alarm value*/
    timer_set_alarm_value(timer_group, timer_idx, ival);
    /*Enable timer interrupt*/
    timer_enable_intr(timer_group, timer_idx);
}

static volatile int count[4] = {0, 0, 0, 0};

static void timer_isr(void *arg)
{
    int timer_idx = (int)arg;
    count[timer_idx]++;
    if (timer_idx == 0) {
        timer_group_clr_intr_status_in_isr(TIMER_GROUP_0, TIMER_0);
        timer_group_enable_alarm_in_isr(TIMER_GROUP_0, TIMER_0);
    }
    if (timer_idx == 1) {
        timer_group_clr_intr_status_in_isr(TIMER_GROUP_0, TIMER_1);
        timer_group_enable_alarm_in_isr(TIMER_GROUP_0, TIMER_1);
    }
    if (timer_idx == 2) {
        timer_group_clr_intr_status_in_isr(TIMER_GROUP_1, TIMER_0);
        timer_group_enable_alarm_in_isr(TIMER_GROUP_1, TIMER_0);
    }
    if (timer_idx == 3) {
        timer_group_clr_intr_status_in_isr(TIMER_GROUP_1, TIMER_1);
        timer_group_enable_alarm_in_isr(TIMER_GROUP_1, TIMER_1);
    }
}

static void timer_test(int flags)
{
    int x;
    timer_isr_handle_t inth[4];
    my_timer_init(TIMER_GROUP_0, TIMER_0, 110000);
    my_timer_init(TIMER_GROUP_0, TIMER_1, 120000);
    my_timer_init(TIMER_GROUP_1, TIMER_0, 130000);
    my_timer_init(TIMER_GROUP_1, TIMER_1, 140000);
    timer_isr_register(TIMER_GROUP_0, TIMER_0, timer_isr, (void *)0, flags | ESP_INTR_FLAG_INTRDISABLED, &inth[0]);
    timer_isr_register(TIMER_GROUP_0, TIMER_1, timer_isr, (void *)1, flags, &inth[1]);
    timer_isr_register(TIMER_GROUP_1, TIMER_0, timer_isr, (void *)2, flags, &inth[2]);
    timer_isr_register(TIMER_GROUP_1, TIMER_1, timer_isr, (void *)3, flags, &inth[3]);
    timer_start(TIMER_GROUP_0, TIMER_0);
    timer_start(TIMER_GROUP_0, TIMER_1);
    timer_start(TIMER_GROUP_1, TIMER_0);
    timer_start(TIMER_GROUP_1, TIMER_1);

    for (x = 0; x < 4; x++) {
        count[x] = 0;
    }
    printf("Interrupts allocated: %d (dis) %d %d %d\n",
           esp_intr_get_intno(inth[0]), esp_intr_get_intno(inth[1]),
           esp_intr_get_intno(inth[2]), esp_intr_get_intno(inth[3]));
    printf("Timer values on start: %d %d %d %d\n", count[0], count[1], count[2], count[3]);
    vTaskDelay(1000 / portTICK_PERIOD_MS);
    printf("Timer values after 1 sec: %d %d %d %d\n", count[0], count[1], count[2], count[3]);
    TEST_ASSERT(count[0] == 0);
    TEST_ASSERT(count[1] != 0);
    TEST_ASSERT(count[2] != 0);
    TEST_ASSERT(count[3] != 0);

    printf("Disabling timers 1 and 2...\n");
    esp_intr_enable(inth[0]);
    esp_intr_disable(inth[1]);
    esp_intr_disable(inth[2]);
    for (x = 0; x < 4; x++) {
        count[x] = 0;
    }
    vTaskDelay(1000 / portTICK_PERIOD_MS);
    printf("Timer values after 1 sec: %d %d %d %d\n", count[0], count[1], count[2], count[3]);
    TEST_ASSERT(count[0] != 0);
    TEST_ASSERT(count[1] == 0);
    TEST_ASSERT(count[2] == 0);
    TEST_ASSERT(count[3] != 0);
    printf("Disabling other half...\n");
    esp_intr_enable(inth[1]);
    esp_intr_enable(inth[2]);
    esp_intr_disable(inth[0]);
    esp_intr_disable(inth[3]);
    for (x = 0; x < 4; x++) {
        count[x] = 0;
    }
    vTaskDelay(1000 / portTICK_PERIOD_MS);
    printf("Timer values after 1 sec: %d %d %d %d\n", count[0], count[1], count[2], count[3]);
    TEST_ASSERT(count[0] == 0);
    TEST_ASSERT(count[1] != 0);
    TEST_ASSERT(count[2] != 0);
    TEST_ASSERT(count[3] == 0);
    printf("Done.\n");
    esp_intr_free(inth[0]);
    esp_intr_free(inth[1]);
    esp_intr_free(inth[2]);
    esp_intr_free(inth[3]);
}

static volatile int int_timer_ctr;

void int_timer_handler(void *arg)
{
    xthal_set_ccompare(1, xthal_get_ccount() + 8000000);
    int_timer_ctr++;
}

void local_timer_test(void)
{
    intr_handle_t ih;
    esp_err_t r;
    r = esp_intr_alloc(ETS_INTERNAL_TIMER1_INTR_SOURCE, 0, int_timer_handler, NULL, &ih);
    TEST_ASSERT(r == ESP_OK);
    printf("Int timer 1 intno %d\n", esp_intr_get_intno(ih));
    xthal_set_ccompare(1, xthal_get_ccount() + 8000000);
    int_timer_ctr = 0;
    vTaskDelay(1000 / portTICK_PERIOD_MS);
    printf("Timer val after 1 sec: %d\n", int_timer_ctr);
    TEST_ASSERT(int_timer_ctr != 0);
    printf("Disabling int\n");
    esp_intr_disable(ih);
    int_timer_ctr = 0;
    vTaskDelay(1000 / portTICK_PERIOD_MS);
    printf("Timer val after 1 sec: %d\n", int_timer_ctr);
    TEST_ASSERT(int_timer_ctr == 0);
    printf("Re-enabling\n");
    esp_intr_enable(ih);
    vTaskDelay(1000 / portTICK_PERIOD_MS);
    printf("Timer val after 1 sec: %d\n", int_timer_ctr);
    TEST_ASSERT(int_timer_ctr != 0);

    printf("Free int, re-alloc disabled\n");
    r = esp_intr_free(ih);
    TEST_ASSERT(r == ESP_OK);
    r = esp_intr_alloc(ETS_INTERNAL_TIMER1_INTR_SOURCE, ESP_INTR_FLAG_INTRDISABLED, int_timer_handler, NULL, &ih);
    TEST_ASSERT(r == ESP_OK);
    int_timer_ctr = 0;
    vTaskDelay(1000 / portTICK_PERIOD_MS);
    printf("Timer val after 1 sec: %d\n", int_timer_ctr);
    TEST_ASSERT(int_timer_ctr == 0);
    printf("Re-enabling\n");
    esp_intr_enable(ih);
    vTaskDelay(1000 / portTICK_PERIOD_MS);
    printf("Timer val after 1 sec: %d\n", int_timer_ctr);
    TEST_ASSERT(int_timer_ctr != 0);
    r = esp_intr_free(ih);
    TEST_ASSERT(r == ESP_OK);
    printf("Done.\n");
}

TEST_CASE("Intr_alloc test, CPU-local int source", "[intr_alloc]")
{
    local_timer_test();
}

TEST_CASE("Intr_alloc test, private ints", "[intr_alloc]")
{
    timer_test(0);
}

TEST_CASE("Intr_alloc test, shared ints", "[intr_alloc]")
{
    timer_test(ESP_INTR_FLAG_SHARED);
}

TEST_CASE("Can allocate IRAM int only with an IRAM handler", "[intr_alloc]")
{
    void dummy(void *arg) {
    }
    IRAM_ATTR void dummy_iram(void *arg) {
    }
    RTC_IRAM_ATTR void dummy_rtc(void *arg) {
    }
    intr_handle_t ih;
    esp_err_t err = esp_intr_alloc(ETS_INTERNAL_SW0_INTR_SOURCE,
                                   ESP_INTR_FLAG_IRAM, &dummy, NULL, &ih);
    TEST_ASSERT_EQUAL_INT(ESP_ERR_INVALID_ARG, err);
    err = esp_intr_alloc(ETS_INTERNAL_SW0_INTR_SOURCE,
                         ESP_INTR_FLAG_IRAM, &dummy_iram, NULL, &ih);
    TEST_ESP_OK(err);
    err = esp_intr_free(ih);
    TEST_ESP_OK(err);
    err = esp_intr_alloc(ETS_INTERNAL_SW0_INTR_SOURCE,
                         ESP_INTR_FLAG_IRAM, &dummy_rtc, NULL, &ih);
    TEST_ESP_OK(err);
    err = esp_intr_free(ih);
    TEST_ESP_OK(err);
}

#include "soc/spi_periph.h"
typedef struct {
    bool flag1;
    bool flag2;
    bool flag3;
    bool flag4;
} intr_alloc_test_ctx_t;

void IRAM_ATTR int_handler1(void *arg)
{
    intr_alloc_test_ctx_t *ctx = (intr_alloc_test_ctx_t *)arg;
    ets_printf("handler 1 called.\n");
    if (ctx->flag1) {
        ctx->flag3 = true;
    } else {
        ctx->flag1 = true;
    }
    GPSPI2.slave.trans_done = 0;
}

void IRAM_ATTR int_handler2(void *arg)
{
    intr_alloc_test_ctx_t *ctx = (intr_alloc_test_ctx_t *)arg;
    ets_printf("handler 2 called.\n");
    if (ctx->flag2) {
        ctx->flag4 = true;
    } else {
        ctx->flag2 = true;
    }
}

TEST_CASE("allocate 2 handlers for a same source and remove the later one", "[intr_alloc]")
{
    intr_alloc_test_ctx_t ctx = {false, false, false, false};
    intr_handle_t handle1, handle2;

    //enable SPI2
    periph_module_enable(PERIPH_FSPI_MODULE);

    esp_err_t r;
    r = esp_intr_alloc(ETS_SPI2_INTR_SOURCE, ESP_INTR_FLAG_SHARED, int_handler1, &ctx, &handle1);
    TEST_ESP_OK(r);
    //try an invalid assign first
    r = esp_intr_alloc(ETS_SPI2_INTR_SOURCE, 0, int_handler2, NULL, &handle2);
    TEST_ASSERT_EQUAL_INT(r, ESP_ERR_NOT_FOUND);
    //assign shared then
    r = esp_intr_alloc(ETS_SPI2_INTR_SOURCE, ESP_INTR_FLAG_SHARED, int_handler2, &ctx, &handle2);
    TEST_ESP_OK(r);
    GPSPI2.slave.int_trans_done_en = 1;

    printf("trigger first time.\n");
    GPSPI2.slave.trans_done = 1;

    vTaskDelay(100);
    TEST_ASSERT(ctx.flag1 && ctx.flag2);

    printf("remove intr 1.\n");
    r = esp_intr_free(handle2);

    printf("trigger second time.\n");
    GPSPI2.slave.trans_done = 1;

    vTaskDelay(500);
    TEST_ASSERT(ctx.flag3 && !ctx.flag4);
    printf("test passed.\n");
}
